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POLYFLOR TECHNICAL INFORMATION WWW.POLYFLOR.COM Polyflor Conductive Laid by: Date: These brass plates are available from the Customer Technical Support Department at Polyflor Polyflor Conductive does not provide protection from a short circuit on a 240/250 volt mains. Where this material is installed, all electrical equipment and switches must be located outside the building. No portable electrical tools should be used inside, unless earth leakage circuit breakers are fıtted to the switchgear. 5.8.1 Test Procedure The electrical testing of the floor must be carried out with an insulation tester, operating at 100 volts D.C. 5.8.2 Test Electrodes The electrode consists of a brass cylinder 65 mm in diameter, weighing approximately 2.5 kg. A screw connector attaches the test lead to the top surface of the cylinder. On the underside is attached a round rubber pad – of 5mm thickness and 65 mm in diameter – which has been covered with thin metal foil (Figure 22). 5.7 HEAT WELDING All Polyflor ESD floorcovering installations (excluding access panels) must be heat welded. Ideally, the floor should be left for a minimum of 24 hours before welding the joints. This will prevent adhesive bubbling up into the seams when heat is applied. For details of heat welding, see Section 8. Note: Conductive welding rod is not a requirement with Polyflor ESD floorcoverings. BRASS FOIL 5.8 TEST METHODS Worldwide, there are a great many test methods for electrical grade floorcoverings and, with rapid developments in the electrical and electronic industries, standards are constantly being reviewed. To ensure that the floor is tested to the latest specifıcation, it is suggested that the architect or specifier should obtain a copy of the test method and requirements from the local office of the National Standards Authority. It should then be attached to the specifıcation prior to the ordering of materials and installation of the floor. If a test method is not specifıed, the following procedure is recommended and approved by Polyflor. Figure 22 Test electrode 5.8.3 Test Conditioning It is essential to condition the floor prior to testing. The floor should be cleaned (see Section 19.10) at least 24 hours before testing, and then conditioned for 24 hours at 40-60% RH and 20-25°C. Note: The relative humidity and temperature are only critical for Polyflor Static Dissipative floorcoverings. 5.8.4 Test Method One electrode should be placed on the floor. The second connection should be made to the earth point, the resistance being measured between the
POLYFLOR TECHNICAL INFORMATION WWW.POLYFLOR.COM electrode and a known earth. One test should be made for every 2 square metres of flooring. The test may not be reliable if made within 24 hours of the flooring being laid or cleaned. 5.8.5 Testing to a Grid The procedure of always testing the same points “on a grid” is not recommended. The whole floor should meet the specifıcation, not just selected points. To ensure continual performance of the whole floor, it should be periodically tested at random points. 5.8.6 Test Results 5.9 STATIC CONTROL SYSTEMS In many instances, a Polyflor ESD floorcovering is suffıcient to give the necessary control, but in highly static-sensitive areas, additional precautions may be necessary. These include: Dissipative clothing and footwear Wrist and heel straps Special work stations Dissipative packaging and sealing Ionisers and humidity controllers Polyflor ESD floorcoverings are manufactured to specific levels of conductance and are tested, prior to despatch, in laboratory conditions. On-site testing not only takes into account the floorcovering but also the adhesive, the subfloor and the environment. When installed and tested in accordance with the instructions laid down by Polyflor and detailed in this manual, the electrical resistance should be as follows: EARTH TEST RESULTS MINIMUM AVERAGE MAXIMUM AVERAGE Static Dissipative 1 x 10 6 ohms 1 x 10 9 ohms Electrostatic Conductive 5 x 10 4 ohms 2 x 10 6 ohms Conductive ROF Zero ohms 5 x 10 4 ohms The Customer Technical Support Department offers, for a fee, a fınished installation testing service – to ensure that the whole installation meets the specifıcation requirements. A Certificate of Conformance is issued on completion. We recommend that you discuss your testing requirements with our Customer Technical Support team, to ascertain staff availability etc. February 2004
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floorcoverings - Polyflor

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